transparent.pass.cpp revision 7a4e3742800a581026478304aade40566031d38d 
1#include <functional>
2#include <string>
3
4template <class _Tp>
5struct is_transparent
6{
7private:
8    struct __two {char __lx; char __lxx;};
9    template <class _Up> static __two __test(...);
10    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
11public:
12    static const bool value = sizeof(__test<_Tp>(0)) == 1;
13};
14
15
16int main () {
17#if _LIBCPP_STD_VER > 11
18
19    static_assert ( !is_transparent<std::less<int>>::value, "" );
20    static_assert ( !is_transparent<std::less<std::string>>::value, "" );
21    static_assert (  is_transparent<std::less<void>>::value, "" );
22    static_assert (  is_transparent<std::less<>>::value, "" );
23
24    static_assert ( !is_transparent<std::less_equal<int>>::value, "" );
25    static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" );
26    static_assert (  is_transparent<std::less_equal<void>>::value, "" );
27    static_assert (  is_transparent<std::less_equal<>>::value, "" );
28
29    static_assert ( !is_transparent<std::equal_to<int>>::value, "" );
30    static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" );
31    static_assert (  is_transparent<std::equal_to<void>>::value, "" );
32    static_assert (  is_transparent<std::equal_to<>>::value, "" );
33
34    static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" );
35    static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" );
36    static_assert (  is_transparent<std::not_equal_to<void>>::value, "" );
37    static_assert (  is_transparent<std::not_equal_to<>>::value, "" );
38
39    static_assert ( !is_transparent<std::greater<int>>::value, "" );
40    static_assert ( !is_transparent<std::greater<std::string>>::value, "" );
41    static_assert (  is_transparent<std::greater<void>>::value, "" );
42    static_assert (  is_transparent<std::greater<>>::value, "" );
43
44    static_assert ( !is_transparent<std::greater_equal<int>>::value, "" );
45    static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" );
46    static_assert (  is_transparent<std::greater_equal<void>>::value, "" );
47    static_assert (  is_transparent<std::greater_equal<>>::value, "" );
48
49#endif
50
51    return 0;
52    }
53